UEqn.H

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    surfaceScalarField muEff
    (
        "muEff",
        twoPhaseProperties->muf()
      + fvc::interpolate(rho*turbulence->nut())
    );

    fvVectorMatrix UEqn
    (
        fvm::ddt(rho, U)
      + fvm::div(rhoPhi, U)
      - fvm::Sp(fvc::ddt(rho) + fvc::div(rhoPhi), U)
      - fvm::laplacian(muEff, U)
      - (fvc::grad(U) & fvc::grad(muEff))
    //- fvc::div(muEff*(fvc::interpolate(dev2(fvc::grad(U))) & mesh.Sf()))
    );

    if (finalIter)
    {
        UEqn.relax(1);
    }
    else
    {
        UEqn.relax();
    }

    if (momentumPredictor)
    {
        solve
        (
            UEqn
         ==
            fvc::reconstruct
            (
                (
                    fvc::interpolate(interface.sigmaK())*fvc::snGrad(alpha1)
                  - ghf*fvc::snGrad(rho)
                  - fvc::snGrad(p_rgh)
                ) * mesh.magSf()
            ),
            mesh.solver(U.select(finalIter))
        );
    }

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